C - struct problems - writing
- by Catarrunas
Hello, I'm making a program in C, and I'mm having some troubles with memory, I think.
So my problem is: I have 2 functions that return a struct. When I run only one function at a time I have no problem whatsoever. But when I run one after the other I always get an error when writting to the second struct.
Function struct item* ReadFileBIN(char *name) -- reads a binary file.
struct tables* getMesasInfo(char* Filename) -- reads a text file.
My code is this:
#include "stdafx.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
int numberOfTables=0;
int numberOfItems=0;
//struct tables* mesas;
//struct item* Menu;
typedef struct item{
char nome[100];
int id;
float preco;
};
typedef struct tables{
int id;
int capacity;
bool inUse;
};
struct tables* getMesasInfo(char* Filename){
struct tables* mesas;
char *c;
int counter,numberOflines=0,temp=0;
char *filename=Filename;
FILE * G;
G = fopen(filename,"r");
if (G==NULL){
printf("Cannot open file.\n");
}
else{
while (!feof(G)){
fscanf(G, "%s", &c);
numberOflines++;
}
fclose(G);
}
/* Memory allocate for input array */
mesas = (struct tables *)malloc(numberOflines* sizeof(struct tables*));
counter=0;
G=fopen(filename,"r");
while (!feof(G)){
mesas[counter].id=counter;
fscanf(G, "%d", &mesas[counter].capacity);
mesas[counter].inUse= false;
counter++;
}
fclose(G);
numberOfTables = counter;
return mesas;
}
struct item* ReadFileBIN(char *name)
{
int total=0;
int counter;
FILE *ptr_myfile;
struct item my_record;
struct item* Menu;
ptr_myfile=fopen(name,"r");
if (!ptr_myfile)
{
printf("Unable to open file!");
}
while (!feof(ptr_myfile)){
fread(&my_record,sizeof(struct item),1,ptr_myfile);
total=total+1;
}
numberOfItems=total-1;
Menu = (struct item *)calloc(numberOfItems , sizeof(struct item));
fseek(ptr_myfile, sizeof(struct item), SEEK_END);
rewind(ptr_myfile);
for ( counter=1; counter < total ; counter++)
{
fread(&my_record,sizeof(struct item),1,ptr_myfile);
Menu[counter] = my_record;
printf("Nome: %s\n",Menu[counter].nome);
printf("ID: %d\n",Menu[counter].id);
printf("Preco: %f\n",Menu[counter].preco);
}
fclose(ptr_myfile);
return Menu;
}
int _tmain(int argc, _TCHAR* argv[])
{
struct item* tt = ReadFileBIN("menu.dat");
struct tables* t = getMesasInfo("Capacity.txt");
getchar();
}**
Thanks in advance.
